Hammer for percussive drills



Patented Sept. 28 1926. i l

UNITED STATES PATENT OFFICE.

WASG SAM PEKOVIQH, F-JNEAU, `'.LIilBRITORY OFl ALASKA.

HAMMER :FORk PERCUSSIVE DRILLS.

Application iled February 4, 1921. Serial No. 442,477.

The invention relates to `lluid operated head 11 with a retaining'member 25 havpercussive drills, and its object is to proing a recess provided in its wall with vide a new and improved hammer for such straight tongues and grooves 26, 27 adapted drills arranged to permit tempering or hardto be engaged by corresponding grooves and ening of the dolly head to any desired detongues on a fixed bar 25a to prevent the 55 gree without injuring thevtongues or ritlies. hammer from rotating during its recipro Another object is to prevent injury to eating movement thus causing a back and the tongues or ritlles on striking the blow. forth turning movement of the chuck 14 b 1 b. .,.fp Wirth tnese and other ob ects in view the and the drilling tool 13 held therein owin invention consists of certain novel features to the spiral tongue and groove connection 60 of construction as hereinafter shown and between the shank 10 and the sleeve or described and then specifically pointed out nut 20. l

in the claim. i lt will be noticed that by the arrange- A practical embodiment of the invention ment described the dolly head 12 can be is represented in the accompanying drawtempered or hardened to any desired degree o5 Y ings forming a part of this application, without atleet-ing the tongues or ritlles 15 in which similar characters of re'terence inthereby insuring the proper working or the dicate corresponding parts in all the views. shankl() in the sleeve or nut 20.

Figure 1 is a side elevation partly in lt will further be noticed that by having section or" the improved hammer for percus-Y the dolly head 12 abutting against the in- 70 sive drills; ner face of the sleeve or nut 2O on the re- Figure 2 is a cross section of the same turn stroke of the hammer, the tongues on the line 2 2 of Figure 1; and or rities 15 are protected against the blow. Figure 3 is a similar view of the same On the chuck 14 is mounted a sleeve guide on the line 3 3 of Figure 1. 30 having a rabbet 31 engaged by a collar 75 The shank 10 of a hammer is provided 32 integral with the chuck 14. The rear at one end with a piston head 11 and at end of the sleeve guide 30 projects beyond the other end with a dolly head 12 adapted the rear end of the chuck into the path to strike blows onto the end of a shank of the piston head 11 to allow the piston an 13 of the drilling tool held in a chuck 14 head 11 to strike the sleeve guide 30 instead So of usual construction. The shank 10 is proof the nut sleeve 20 to prevent injury to vided on its peripheral surface between the the latter. The sleeve guide is held in dolly head 12 and the piston head 11 with place in the cylinder34 of the drill by the spiral tongues 15 and grooves 16 engaging chuck casing 35.

formed in the inner surface of a sleeve or claim as new and desire to secure by Letters nut 20 screwed or otherwise secured in the Patent y chuck 14. In practice the sleeve or nut 2O In a percussive drill, a hammer vhaving is made of two parts, as indicated in Figa shank spirally grooved for its major por ure 3, and one of the parts is fastened by tion and having a rigid ungrooved tempered 90 a key 21 to the chuck 14 to prevent the dolly head at the forward end ot the spirnut sleeve 20 from turning after being ally grooved portion adapted to deliver the screwed in place. `When the hammer 10 impact of the hammer against the drill bit, is in its extreme position to the left then said dolly head having a diameter greater the dolly head 12 abuts against the inner than that 0f the Spirally grooved portion ai face of the Sleeve 0r nut 20 thus limiting of the drill head, said dolly head providthe movement from the right to the left ing for a uniform tempering of the impact or" the hammer relatively to the chuck 14 end of the hammer.

and its sleeve or not 20. The hammer is pro- Y vided on the left-hand face of the piston WASO SAMPEKOVICH.

corresponding grooves and tongues 17, 18 VHaving thus described Vmy invention, I 85 

